Arc-lamp.



W. R. MGTT,

ARG LAM?.

APPLIGA'HON FILED JULY 29, 1.911,

inl-mm mg.

I UNITED sTATEs rATnNT OFFICE.'

WILLIAM ROY MOTT, OF LAKEWOOD, OHIO, ASSIGNOR TO NALIONAI: CARBON COM- IPANY, QF "CLEVELAND, OHIO, A CORPORATION OF NEW JERSEY.

ARC-LAMP.

Specification of Letters latent.

Patented Aug. 27, 1912.

l To all whom it may concern Be it known that I, IVILLIAM Roi. MOTT, a citizen of the United States, resi ding at Lakewood, in the county of Cuyah aga and State of Ohio, have invented a certain new Aand useful Improvement in Arc-Lamps, of

which the following is a full, clear, and en-f 'sides of the arc, lcast deep shadows when clear glass globes are employed, and these shadows can be avoided only by the use of frosted globes which reduce very materially the efficiency of light transmission.

The main object of the present invention is to increase the efficiency, desirability and field of use of lamps of the character stated, and particularly to provide an arrangement whereby the use of these outside down-draft hollow arms can be avoided so that clear globes can be employed without `shadows and light obstruction.

The above and numerous other objects and advantageslsome of which 'will be re ferred to later, are accomplished by my invention whichmay be briely summarized as consisting in certain novel combinations and arrangements of parts which will be described in the specification and set forth ,in the appended claims.

In the drawings, Figure 1 is a side elevation partly in section of a lamp constructed in accordance with one form of my invention; Fig. 2 is a transverse sectional view substantially along the line 2 2 of Fig. 1l

looking in the direction indicated by the arrows; Figs. 3 and 4 are diagrammatic plan views illustrating the application of my invention to groups of three and :tour arcs respectively.

In carrying out my 'invention for the acf complishment of the objects which have in view, I employ a plurality of arcs,-two -or more, having a condensing inclosure wherein the down draft part or parts may be so arranged as to avoid all 'light obstruction. lV-ith the plurality ofarcs, I prefer to employ a unitary condensing inclosure having a down draft iuc for the condensation of the major portion of the gases, or the depositing of the finely divided particles carried by the gases. which flue may be common to the several arcs and may be arranged centrally between them.

In Figs. 1 and 2, is illustrated my-idea wherein two arcs are employed, and in these iigures A and A represent respectively two sets of -flaming arc electrodes which are inclosed ,within cylindrical globes B and B which may, if desired, be inclosed in outer spherical globes C and C. These inner globes B and B constitute parts of the closed ccnden sing circuit and may be termed the updraft parts, inasmuch as the gases flow upwardly through them. The condensing circuit also vincluses the top portion or upper chamber D to which the upper ends of t-he globes are connected, and are in open communication, and the bottom portion E, or lower chamber to which the lower .parts of the globes are connected and are in open communication. For the down draft or re'. turn flow of the gases, I prefer to employ a single central flue in the form of a tube which may be arranged midway between the arcs or in the center of the group. This tube F which is connected at its top to the upper part D of the condensing circuit and its bottom to the lower part E of the condensing circuit. constitutes a down draft arm which is common to the several arcs, and with the other parts of the condensing circuit previously described. forms a single or unitary condensing inclosure for all the arcs.

I have endeavored to illustrate my invention clearly without any attempt to show details of the actual construeion which is or may be employed.

The internal operating mechanism of the lamp, including the clutch, feedfautomatic' cut-outs, etc., may be arranged within a sin-i gle hood or casing Gr, but whether-"there isa Y single .hood G forall the arcs, or a 'separatel: Ur

one for each are is entirely immateria-lto the present invention.

To enhance the condensation of gases in thc down draft tube l?, I may employ some means for increasing the cooling eifect. rIhis is secured in the present case by means of an inner tube H, which is arranged centrally within the down draft tube F and is open at both ends so that there may be an upward flou' of cooling air currents throughout the time that the lamp is in use.

In Fig. 3 is illustrated the adaptation of my invention to three arcs which are shown conventionally at I, I and I2. The inner globes of these arcs are connected toa top portion of the condensing circuit indicated at- J, andv consisting in this case of-three, radial arms united at the center to which the down draft arm shown at K by dotted lilies is connected. It will be understood that the bottom portions of the inner globes and of the down d aft tube K willV be connected to a similar lower portion'or cham ber of the condensing circuit.

In Fig. 4, four lamps are shown conventionally at L, L', L2 and L3. The tcp of Y the condensing circuit, as here shown, consists of four arms M connected at the center to which the down draft tube N is connected.

The objects of Figs-3 and 4 are to illustrate the fact that the same idea disclosed in Fig. l may be embodied in an arrangement having any number of arcs and provided with a 'unitary condensing inclosure including a down draft portion which is Yarranged between or centrally of all the arcs.

The most important advantage claimed in connection with the arrangement sho-wn in the drawings is the much improved light distribution and elimination of shadows. Inasmuch as there are no light obstructing arms along the outer sides of any of the arcs, and as in` all instances at least one aro is always directly visible in-a horizontal circuit about the lamp, clear glass globes may be employed, thus obtaining an improved light distribution and much better efficiency in light transmission through the globes.

Vhile I have shown only several slightly different embodiments of my invention, I do not wish to be confined to any `particular form, construction, or arrangement, except as I am limited by the terms of the claims.

Having thus described my invention, what I claim is l. In a lamp unit, electrodes for a plurality of arcs closely arranged in a group, and a condensing .inclosure comprising' globesy inclosing the several arcs, and a down draft flue common to all the arcs and located in the group in communication at the top and bottom with the arc inclosing globes thereof.

2. In a lamp unit, electrodes for a plurality of arcs, and a condensing inclosure for the circulation of gases comprising arc inclosing globes for the up draft of gases, and

`a down draft ue in communication with the globes and arranged between the arcs.

3. In a lamp unit, electrodes for a plurality of arcs closely arranged in a group, a condensing inclosure for the circulation of gases comprising arc inclosing globes through which t-he gases pass upwardly, and

'ad'own draft flue common to two or more arcs and eonnectedat its top and bottom to the globes thereof, said flue being arranged between the arcs.

4. In a lamp unit, electrodes for a plurality of arcs, a condensing inclosure for the several arcs including arc inclosing globes for the updraft of gases, and a down draft Hue in communication at its top and bottom with the globes and arranged centrally between the arcs. l v

5. Inra lamp unit, electrodes for a plurality of a-cs arranged in a group, a unitary gas condensing inclosure comprising arc inclosing globes, an upper chamber connected to the upper ends of the globes, a lower chamber connected to the lower ends ofthe globes, and a down draft tiue for the downward passage of gases from all vof the arcs connected to said upper and lower ,chambers centrally thereof.

6. In a lamp unit, electrodes for a plurality of arcs, a condensing inclosure for the circulation of gases comprising arc inclosing globesfor the up-draft of the gases, a down-draft flue connected to the globes, and means for cooling the gases passing through said flue.

In testimony whereof, I hereunto atx my signature inthe presence of two witnesses. WILLIAM ROY MOTT. Witnesses:

H. R. SULLIVAN,

4 A. F. Kwis.

Copiegpf this patent may be obtained for we. centseach, by addressing lthe Commissioner ci! @atenta-I Washington, D. C. 

